21-08-2014, 09:21 AM
A helipot (multiturn) might help, good quality pots are normally the best when used for feedback control loops.
Your project aside, an active broadband magnetic loop is also a possible option, no tuning required, I have heard that the Wellbrook loop works well, some years ago I spoke to the man who designed them, a chap called Andy Ikin, nice fella and knowledgeable, the loop is balanced with an unbalanced output, the active amplifier has a certain amount of impedance tracking that follows the impedance of the loop, it covers the normal broadcast band through to 30 mhz.
Lawrence.
Your project aside, an active broadband magnetic loop is also a possible option, no tuning required, I have heard that the Wellbrook loop works well, some years ago I spoke to the man who designed them, a chap called Andy Ikin, nice fella and knowledgeable, the loop is balanced with an unbalanced output, the active amplifier has a certain amount of impedance tracking that follows the impedance of the loop, it covers the normal broadcast band through to 30 mhz.
Lawrence.
